Integration of the patented Ultima "field effect" sensing technology into the bilge pump body creates a sleek, reliable compact, unit ready to install and run. UltimaBilge 600GPH-100GPH, have Dura-Port discharge ports, both a straight and a 90 degree smooth elbow. 1250 GPH have threaded 1-1/4" & 1-1/8" discharge port. All version are delivered with a removable check valve.